Citation: YUAN Hai-Xia, PAN Hu-Xiang, WU Yan-Lin, ZHAO Jian-Feng, DONG Wen-Bo. Laser Flash Photolysis Mechanism of Pyrenetetrasulfonate in Aqueous Solution[J]. Acta Physico-Chimica Sinica, ;2012, 28(04): 957-962. doi: 10.3866/PKU.WHXB201202203 shu

Laser Flash Photolysis Mechanism of Pyrenetetrasulfonate in Aqueous Solution

1.
1. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, P. R. China;
2. Institute of Naval Medicine, Shanghai 200433, P. R. China

Received Date: 4 November 2011
Available Online: 20 February 2012
Fund Project: 国家自然科学基金(20777012) (20777012)教育部博士点基金(200802460006)资助项目 (200802460006)

The mechanism of photochemical reactions of pyrenetetrasulfonate (PyTS) in aqueous solution was studied using laser flash photolysis-transient absorption spectrum techniques under irradiation at 355 nm. The characteristic absorption peaks of the excited singlet (PyTS^1*) at 260 nm, the excited triplet (PyTS^3*) at 300 nm, and the anion radical (PyTS^-·) at 330 nm were first confirmed. Self-quenching and reaction with PyTS were regarded as the main decay channels for hydrated electrons (e_aq^-), and the pseudo-first-order rate constant of hydrated electrons with PyTS was determined to be 2.7× 10⁵ s^-1. The quantum yield of e_aq^- generated via two-photon ionization of PyTS was computed to be 3.2×10^-2 under these conditions.
- Laser flash photolysis,
- Free radical,
- Hydrated electron,
- Quantum yield,
- Transient absorption
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